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It may be very bothersome later on if radiation colitis (colon) or proctitis (rectum) develops, which can be very irritating and annoying with its attendant diarrhea. Fortunately, the vast majority of patients have little if any long lasting side effects.

In brief:
Varies

Depends on the side effects you experience.

It may be very bothersome later on if radiation colitis (colon) or proctitis (rectum) develops, which can be very irritating and annoying with its attendant diarrhea. Fortunately, the vast majority of patients have little if any long lasting side effects.
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On rare occasions there can be chronic changes in bowel habits such as diarrhea, or scar tissue can form which has the potential to cause a mechanical obstruction.
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